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drm/sun4i: hdmi: create a regmap for later use

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The HDMI driver is written with readl/writel I/O to the registers.
However, to support the A31 variant, which has a different layout
for the DDC registers, it was recommended to use regfields to have
a cleaner implementation. To use regfields, we need to create an
underlying regmap.

This patch only adds the regmap. It does not convert the existing
driver accesses to use regmap.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171010032008.682-5-wens@csie.org
This commit is contained in:
Chen-Yu Tsai 2017-10-10 11:20:01 +08:00 committed by Maxime Ripard
parent 544c5048bc
commit 4b1c924b1f
2 changed files with 16 additions and 0 deletions
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1
drivers/gpu/drm/sun4i/sun4i_hdmi.h
View File

@ -163,6 +163,7 @@ struct sun4i_hdmi {
struct device *dev;
void __iomem *base;
struct regmap *regmap;
/* Parent clocks */
struct clk *bus_clk;

15
drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
View File

@ -22,6 +22,7 @@
#include <linux/iopoll.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include "sun4i_backend.h"
#include "sun4i_crtc.h"
@ -267,6 +268,13 @@ static const struct cec_pin_ops sun4i_hdmi_cec_pin_ops = {
};
#endif
static const struct regmap_config sun4i_hdmi_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = 0x580,
};
static int sun4i_hdmi_bind(struct device *dev, struct device *master,
void *data)
{
@ -321,6 +329,13 @@ static int sun4i_hdmi_bind(struct device *dev, struct device *master,
goto err_disable_mod_clk;
}
hdmi->regmap = devm_regmap_init_mmio(dev, hdmi->base,
&sun4i_hdmi_regmap_config);
if (IS_ERR(hdmi->regmap)) {
dev_err(dev, "Couldn't create HDMI encoder regmap\n");
return PTR_ERR(hdmi->regmap);
}
ret = sun4i_tmds_create(hdmi);
if (ret) {
dev_err(dev, "Couldn't create the TMDS clock\n");